You can type the whole of the product number.And you don't need to disthinguish the capital letter and small letter,you aslo can search by part.you must input 4 Word stanza .For instance,you want to search whether there is the product TDA7088Tin stock,you can type the whole number TDA7088Tor tda7088T,you can aslo type the key word 7088band soon.if there are some products according with this search condition,the result will turn out.